406 DESCRIPTION OF THE COUNTRY BORDERING 
the intercalated and overlying trap-beds, ascend nearly to the summit of the 
ridge, dip southeast, at an angle of 4°. Overlying the slates, on the flank of the 
ridge, is a bed of crystalline greenstone (No. 5), the same that is found capping 
them over a large district of country. The junction of the slates with the green- 
GORGE AND FALLS OF PIGEON RIVER. 
stone is exhibited, by the first section on page 407, by Major Owen, of an escarp- 
ment, a short distance above the fall. In the drift on the summits of the ridges, 
many fragments of red sandstone (No. 6) occur. 
About one mile further up the river, is a small fall, where the exposure of the 
slaty beds is sixty feet thick, and capped by a bed of greenstone. Below this fall, 
